. Elementary entomology . FIG. 101. Rocky Mountain locust laying eggs rt, females ovipositing, with earth cut away to show tip of abdomen placing eggs at d, and completed egg mass at c; c, eggs. (After Riley) in color, but the hind-wings are black, with a broad yellow edge quite conspicuous in flight. Throughout the Mississippi Valley the differential locust (Melanoplus diffcr- cntialis) is one of the most destructive forms, being particu- larly injurious after floods, when it multi- plies rapidly on the un- cultivated land which has been flooded. A generation ago (1874 -1877), the crops of th
. Elementary entomology . FIG. 101. Rocky Mountain locust laying eggs rt, females ovipositing, with earth cut away to show tip of abdomen placing eggs at d, and completed egg mass at c; c, eggs. (After Riley) in color, but the hind-wings are black, with a broad yellow edge quite conspicuous in flight. Throughout the Mississippi Valley the differential locust (Melanoplus diffcr- cntialis) is one of the most destructive forms, being particu- larly injurious after floods, when it multi- plies rapidly on the un- cultivated land which has been flooded. A generation ago (1874 -1877), the crops of the western part of the Mississippi Val- ley were utterly de- stroyed for several years by the clouds of Rocky Mountain or migratory locusts (Melanoplns spretns] which swooped down from the tablelands of the northwest, where they bred and mul- tiplied. Accounts of the numbers and voracity of these locusts seem almost incredible to-day, except to those who have seen an occasional outbreak in the northwest, for with the set- tling and development of the western plateau they have become less abundant, and are now injurious only in Minnesota, the Dakotas, and Manitoba. In the mid- FIG. 102. The Carolina locust {Dissosteira die and Southern States the Carolina], female. (Slightly enlarged) large bird grasshopper, or (After Lugger)
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